This application note introduces electromagnetic compatibility (EMC) testing including a brief introduction and test setup specified for IEC 61000-4-x and CISPR 11 test standards. The test solution for collecting data through optical fibers from the ADS8686S EMC test board in this design has been proven to be reliable and feasible. The test results also demonstrate a robust EMC design solution based on the ADS8686S for industrial applications. The testing methods and data collection solution can be used in any similar IEC 61000-4-x and CISPR 11 testing for precision ADC systems.